Seagate's Momentus - Full Disk Encryption

Seagate's Momentus FDE.2 full-disk encrypted hard drives put the reviewer in a quandary. If a product's intent is to be invisible, a behind-the-scenes tech that handles its job without getting in the user's way, what does one talk about when it functions as advertised? It's like reviewing a light bulb or a brick: all you need to know is that it works.